This has also happened to me. I, personaly,think it is a lag issue.
I haven't used zonealarm in awhile, but if I remember you need to go into the programs part of zonealarm and tell it that mohaa.exe is ok to access the internet.
I wouldn't worry about this being a virus. At worst, it's some loser who made a goofy mod and thinks it's funny. Like I saw, I really think it's just a lag issue. Just try another game.
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